* {
    margin: 0px;
    padding: 0px;
    font-size: 0px;
    list-style: none;
}

.main {
    width: 500px;
    height: 700px;
    border: 2px solid black;
    margin: 0px auto;
    overflow: hidden;
    position: relative;
}
.main-img{
    height: 700px;
    width: 2500px;
    position: absolute;
    transition-duration: 0.3s;
}
.img{
    float: left;
    width: 500px;
    height: 700px;
}
.btn{
    width: 50px;
    height: 50px;
    border: 0;
    border-radius: 50%;
    top: 350px;
    position: absolute;
    background-color: transparent;
    cursor: pointer;
}
.btn:hover{
    background-color: violet;
}
.btn:focus { 
    outline:none; 
}
.btn:active{
    border: 1px solid blue;
}
.btn-2{
    left: 450px;
}
.btn i{
    color: aqua;
    font-size: 50px;
}
.main-ul{
    background-color: rgb(134, 255, 255);
    width: 100px;
    height: 20px;
    position: absolute;
    top: 670px;
    left: 200px;
    border-radius: 10px;
}
.main-li{
    margin-top: 3px;
    background-color: rgb(255, 208, 147);
    border-radius: 50%;
    width: 15px;
    height: 15px;
    float: left;
    margin-left: 8px;
    cursor: pointer;
}
.main-li-2{
    margin-top: 3px;
    background-color: white;
    border-radius: 50%;
    width: 15px;
    height: 15px;
    float: left;
    margin-left: 8px;
    cursor: pointer;
}
.main-li:hover{
    background-color: white;
}